Recently I noticed that when I apply some operation on area selected with magic wand (for example desaturation or brightness modification) not only pixels from selections are modified. When modification has big strength I can see that pixels laying even 20 pixels away from selection border are slightly modified.
From the other hand: I don't see this effect on normal selections.
So I have two questions:
1) Is it any way to manipulate strength of this effect (modify maximum affected distance)?
2) Is it any way to use this effect with other kinds of selections?